Jump to content
SAU Community

Recommended Posts

Hey forum I am at a stand still with my rebuild and just need some expert opinions to get going again. Ok here is the deal I am currently in the process of rebuilding my engine, lost the ring on number six so since it had to open up neway I decided to strengthen it up a bit. I just changed the head gasket to a thicker cometic one and got a set of forgies the wiseco 87mm, all the other little things are getting done as well (oil pump, water pump, tensioners, timing belt etc...,) and what I want to know is if its just as simple as boring out the block to fit the bigger pistons. My main reason for going bigger and forge was to get my monies worth out the rebuild and engine strength for when I fit a bigger turbo. The specs on the piston can be found here http://www.wiseco.com/PDFs/Catalogs/SC08/NissanSubaruToyotaVW.pdf and I just wanted to know if I will run into any problems fitting these pistons, will still be using all original engine parts only the head gasket and pistons will be changed. So can these pistons be fitted to the same conrods and crank do I have to worry bout squish and quench and all that other technical stuff I have been reading up on? I am not looking for any particular compression or trying to build a superior race engine just want to strengthen the engine a bit and get my car back on the road with a somewhat stronger engine. I just want to get it bored drop the pistons in with the new head gasket and close it up.Can this be done or willI have problems?

Link to comment
https://www.sau.com.au/forums/topic/211146-very-confused/
Share on other sites

So you want to make the engine stronger but you want to bore it out to 87mm? If something happens and the engine does have to be re bored you have to go custom pistons next time. Why not get 86.5mm pistons or even 86mm if the bores are still good?

Link to comment
https://www.sau.com.au/forums/topic/211146-very-confused/#findComment-3733127
Share on other sites

So you want to make the engine stronger but you want to bore it out to 87mm? If something happens and the engine does have to be re bored you have to go custom pistons next time. Why not get 86.5mm pistons or even 86mm if the bores are still good?

I was thinking that as well but wiseco does not make 86mm for the rb25 only 86.5mm. If i were to get the 86.5mm it will still have to be bored so I just went with the 87 mm as I was thinking it will handle more boost and increase comp ratio a bit. Do you know of any compny that are affordable and have the rb25 standard size pistons forged?

Link to comment
https://www.sau.com.au/forums/topic/211146-very-confused/#findComment-3733258
Share on other sites

So you want to make the engine stronger but you want to bore it out to 87mm? If something happens and the engine does have to be re bored you have to go custom pistons next time. Why not get 86.5mm pistons or even 86mm if the bores are still good?

Should have gone for the 86.5mm pistons.

Link to comment
https://www.sau.com.au/forums/topic/211146-very-confused/#findComment-3733266
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • I’m not sure what happened I told them about sonic tunes free OTS tune and the next the I know .. I was booted..   To funny 
    • Yea - I mean I've seen my fuel pump which is decades old and uh, while I'm not saying this with real knowledge... but I sure get the ick at using anything in the fuel system that produced the state of that pump. Many years ago I went through multiple pumps (and strainers) before I dropped the tank to clean it out with extreme violence. I'm talking the car would do maybe 50km before coming to a halt, which resulted in me cleaning out the filter with some brake cleaner and going on my way. None of my stuff ever looked like what came out of your fuel tank. I don't think I'd be happy with it unless every single component was replaced (or at least checked/cleaned/confirmed to be clean here).
    • I'm not going to recommend an EBC pad. I don't like them. Just about anything else would suit me better. I've been using Intima pads for a while now.
    • Agreed, and in particular the earth strap that should go from the subframe to the chassis but it often broken or left off. There is a section in the R32 workshop manual you can follow for troubleshooting if you don't see anything suspicious, and depending where you are (there is no location on your user profile) you should be able to get your hands on a second hand replacement unit still if needed
    • Yeah they mention as a R34 for 2.5 Turbo...but then again thos "small" were also for R34 by that different site. But i look into it and that 310mm EBC is for R34 GTT. And by those you linked the specs are the same 🙂    EDIT: I found these on one site here: DBA 4000 series T3 DBA42304S They are 310mm...and it says are for R34GTT...are there good? EDIT2: ok they have pads too.  What "color" should i get for street use? I dont want/need some noisy ones...(and if they are not that dusty that is good too)
×
×
  • Create New...